The Museum of Fine Arts of Bilbao is one of Spain's most important art institutions. Its origins trace back to the first Fine Arts Museum, founded in 1908, and the Museum of Modern Art opened in 1924. These two museums merged in 1945, forming the current institution. The museum's extensive collection spans from the 12th century to contemporary art, featuring masterpieces by renowned artists such as El Greco, Goya, Velázquez, Picasso, and Francis Bacon. Notably, it houses the most significant collection of Basque art, including works by Regoyos, Zuloaga, and Echevarría.

One of the largest ossaries in Spain, this macabre vault in Santa Maria Church contains the skeletons of thousands of monks and villagers. An unusual attraction, the Ossary is only open on Fridays, Saturdays and Sundays (Friday: 16:30-18:30, Saturday 10:30-13:30 and 16:30-18:30, Sunday 10:30-12:00 and 16:30-18:30).

The Academy Of Cavalry is a beautiful building in the heart of Valladolid. This museum is located in the splendid building of the Academia del Arma. You can rarely visit the inside, but the outside is worth having a look with its impressive facade and fountains.

The Mausoleum at Halicarnassis, one of the Seven Wonders of the Ancient World, still stands today, albeit in remnants. Its true appearance remains a mystery to many, but it's believed that the renowned sculptor, Skopas, lent his talent to parts of its decoration — and it was undoubtedly extravagant. Nowadays, you can only gaze upon the remains of the once majestic building's walls, the rest having been claimed by earthquakes and the passage of millennia.